Results 141 to 150 of about 293,197 (180)

Evaporative Cooling in Forced Duct Flow

Transactions of the Canadian Society for Mechanical Engineering, 1975
The cooling of inside surfaces of heated ducts by the process of forced convection with evaporation is studied. Cooling is achieved by liquid-evaporation from the duct surface into a turbulent gas flow. An analysis is developed for predicting the stream and surface temperatures. Data are presented for air-water mixtures.
M.A. Kellow, J.H. VanSant, M. Tarabulsy
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Assessment of evaporation duct propagation simulation

2011 XXXth URSI General Assembly and Scientific Symposium, 2011
The evaporation duct strongly influence microwave radars and communication systems. For evaluation of their performance in such environment combination of split-step parabolic equation and Monin-Obukhov similarity theory are usual approach. There are several variants of semiempirical functions used in the similarity theory which leads to different ...
Iurii Levadnyi, Victor Ivanov, Vyacheslav Shalyapin   +2 more
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A modern global evaporation duct climatology

2008 International Conference on Radar, 2008
Climatologies of evaporation duct conditions over the worldpsilas ocean areas are important for radar system design studies and operational planning. The evaporation duct climatology currently in use by the U.S. Navy was developed in the mid-1980s.
Paul A. Frederickson, J. Thomas Murphree, Katherine L. Twigg, Amalia Barrios   +3 more
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Study on NPS Evaporation Duct Model

2010 6th International Conference on Wireless Communications Networking and Mobile Computing (WiCOM), 2010
Over the ocean, there is mutual effect between air and sea. This effect would affect atmospheric refractivity, or modified atmospheric refractivity, and a lot of kinds of the profiles of atmospheric refractivity and modified atmospheric refractivity will happen.
Ning Zhang, Nan Li, Bin Tian, Hao Cha, Mo Zhou   +4 more
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Evaluation of the transient electromagnetic field in evaporation duct

Applied Mathematics and Computation, 2004
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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A Ray-Optics Approach for Evaporation Duct Channel Modeling

2018 10th International Conference on Wireless Communications and Signal Processing (WCSP), 2018
In this paper, a three-stage ray optics (RO)-based modeling approach is proposed to characterize the maritime evaporation duct channel. The channel model follows the classic form which is a superposition of multipath components (MPC), while each MPC corresponds to an arrived ray identified by the RO method.
Haifeng Zhou, Jue Wang 0006, Qiang Sun 0001, Wei Feng 0001, Li You 0001, Chen Xu 0005   +5 more
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The transient response above an evaporation duct

Journal of Physics D: Applied Physics, 1998
The transient electromagnetic field generated by a vertical electric dipole above an evaporation duct is investigated theoretically. The evaporation duct model used is that previously described by Kahan and Eckart. A vertical electric dipole, above the surface layer, is taken as the source of the electromagnetic field. We determine the electrical field
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Propagation Theory for the Evaporation Duct

1973
Propagation in radio ducts first attracted attention during the 1940’s and was the subjectof some notable theoretical studies (1),(2),(3).Recent developments such as the use of the Monin-Obukhov similarity theory(4) to give realistic refractive index models, improvements in theoretical and numerical methods and the need to incorporate other phenomena ...
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94-GHz propagation in the evaporation duct

IEEE Transactions on Antennas and Propagation, 1990
One-way, low-altitude radio propagation measurements at 94 GHz and simultaneous surface meteorological measurements were made on a 40.6 km, over-horizon, over-water path along the southern California coast to assess the effects of the evaporation duct on signal propagation.
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Influence of evaporation ducts on radar sea return

IEE Proceedings F Radar and Signal Processing, 1990
Modelling of radar sea return is discussed with consideration of propagation conditions. Both the intensity and propagation direction of energy incident at the sea surface can be significantly affected by the refractive condition of the atmosphere. The authors describe and evaluate a model that incorporates both of these effects for the situation where
J.P. Reilly, G.D. Dockery
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